單項(xiàng)選擇題

An un-loader is installed on an air compressor to （）.

A.bypass the high pressure stage to the low pressure stage on 100% of the air compressors in service
B.prevent excessive inter-stage pressure buildup
C.control compressor discharge pressure
D.remove all but the frictional load during starting

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單項(xiàng)選擇題

After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?（）

A.The relief valves in the system should be readjusted
B.The filters and strainers should be checked frequently
C.All system pressure should be readjusted
D.The system should be drained and renewed with a fluid of different operating characteristics

單項(xiàng)選擇題

For safe storage, the maximum allowable temperature to which refrigerant bottles should be exposed is （）.

A.100℃
B.125℃
C.150℃
D.175℃

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An un-loader is installed on an air compressor to （）.

你可能感興趣的試題

After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?（）

For safe storage, the maximum allowable temperature to which refrigerant bottles should be exposed is （）.

99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精